CGridView里面怎样写多个判断？ [ 新手入门 ]

CGridView里面写多个判断，就像if,elseif这种类型的。我下面这样写，就第一个有效，下面的都没效果......

array(
  'header'=>'級別',
  'name'=>'composition.level',
  'value'=> '$data->composition->level==4&&$data->composition->platform_id==1?"小一":" ";							                                                 $data->composition->level==4&&$data->composition->platform_id==1?"小二":" ";								                                         $data->composition->level==4&&$data->composition->platform_id==1?"小三":" ";								                                         $data->composition->level==4&&$data->composition->platform_id==1?"小四":" "',
  'type'=>'raw',
  'filter'=>false,
),